Neither the tank nor the airplanes won the war. They did start to play an ever more important part at the end of the war though, with strategic bombers being developed and armored personel carriers and break through tanks. Had the war gone into 1919 and the planned invasion of Germany then we would have seen what those could do in offensive warfare.

although they had gas masks they made a bad dessicion gas masks didnt work well then and most of the time they failed there best disscion was to jump from the trench and try to charge the enemy trench id rather be shot then be kill by that dreaded gas

The special equipment and uniforms the germans developed in WW1 gave their flamethrower guys a creepy and outer world aspect, i think they look cool, but would not like to face battle against those guys.